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Circuit/System Testing

WARNING: This page is about a different car, the 2011 GMC Canyon and 2011 Chevrolet Colorado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X2 harness connector at the driver door lock window switch.
  2. Disconnect the harness connector at the passenger door lock window switch.
  3. Connect a test lamp between the driver door lock switch control circuit terminal 7 and B+.
  4. Ignition ON, command the doors to LOCK with a scan tool. The test lamp should illuminate during the LOCK command.
    • If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
    • If the test lamp is always ON, test the control circuit terminal for a short to ground. If the circuit tests normal, replace the BCM.
  5. Ignition OFF, connect the harness connector at the passenger door lock window switch and disconnect the harness connector at the BCM.
  6. Ignition ON, command the doors to LOCK by using the passenger door lock window switch. The test lamp should illuminate during the LOCK command.
    • If the test lamp is always OFF, replace the passenger door lock window switch.
    • If the test lamp is always ON, replace the passenger door lock window switch.
  7. If all circuits test normal, replace the driver door lock window switch.
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